Allow using system dSFMT

[nalimilan]

Add USE_SYSTEM_LIBRANDOM variable. Rename librandom to
dSFMT since distributions call it that way.

These changes are required to get Julia packaged in Fedora, since I was not allowed to bundle dSFMT in the Julia package: instead, I'm going to use the system library. This seems to work (i.e. I can get Julia to use the system library), but for some reason make always builds and installs dSFMT. Help welcome.

This requires a change in JuliaStats/Rmath-julia#4. I've not tested Rmath at the moment.

[ViralBShah]

We should probably rename librandom to libdSFMT as well. We used to have some other C code for randn, which is now moved to julia.

[nalimilan]

Yeah, I was not sure about this one. Updating the PR.

Travis fails because of the Rmath commit is not available. And unfortunately it cannot be merged before this one...

[nalimilan]

Done. I've removed the Rmath submodule update for now so that Travis can work.

[ViralBShah]

Why don't you update the Rmath submodule as well? We are all here at the Julia Hack day at UChicago, so it should be easy to get stuff done.

[nalimilan]

Why don't you update the Rmath submodule as well? We are all here at the Julia Hack day at UChicago, so it should be easy to get stuff done.

Because Travis cannot find the commit until it's merged, and I'd like to see the tests pass once. When it's OK I'll add Rmath back.

[nalimilan]

OK, Travis tests passed. I've added back the Rmath update.

[ViralBShah]

Oops - sorry, I guess we do not have a way to update Rmath on the nightlies. I wonder if @staticfloat is around.

[ViralBShah]

Never mind - we do pull Rmath in the travist tests.

[ViralBShah]

Ok, both are merged now.

[ViralBShah]

I am now getting this. What is the right way to install dSFMT.h? Should we put it in our JULIAHOME/usr/include when not using the system one?

clang -stdlib=libc++ -mmacosx-version-min=10.7 -m64  -Wall -O3 -fPIC -DMATHLIB_STANDALONE -I/Users/viral/julia/usr/lib   -std=gnu99 -I../include -DNDEBUG -c randmtzig.c -o randmtzig.o
randmtzig.c:68:10: fatal error: 'dSFMT.h' file not found
#include "dSFMT.h"
         ^
1 error generated.
make[1]: *** [randmtzig.o] Error 1

[ViralBShah]

There's a typo in deps/Makefile. Fixing it.

[ViralBShah]

Done in 20422c6

[nalimilan]

Thanks! Do you know why dSFMT is built even when USE_SYSTEM_DSFMT=1?

[ViralBShah]

I have a fix for it. Coming in a bit.

[ViralBShah]

Can you try master and see if it does the right thing now?

[nalimilan]

Seems to work. Thanks! I'll try to build a RPM using system dSFMT.

[nalimilan]

Building RPM also works (though I get an apparently unrelated error).